added undo/redo

Source/Builder.csproj

@@ -65,6 +65,9 @@
     <Compile Include="Editing\LinedefsMode.cs" />
     <Compile Include="Editing\SectorsMode.cs" />
     <Compile Include="Editing\ThingsMode.cs" />
+    <Compile Include="Editing\UndoGroup.cs" />
+    <Compile Include="Editing\UndoManager.cs" />
+    <Compile Include="Editing\UndoSnapshot.cs" />
     <Compile Include="Editing\VerticesMode.cs" />
     <Compile Include="Editing\ClassicMode.cs" />
     <Compile Include="Controls\ActionDelegate.cs" />
@@ -281,6 +284,8 @@
   </ItemGroup>
   <ItemGroup>
     <Content Include="Resources\Builder.ico" />
+    <None Include="Resources\Redo.png" />
+    <None Include="Resources\Undo.png" />
     <None Include="Resources\Grid2.png" />
     <None Include="Resources\Hourglass.png" />
     <None Include="Resources\Filter.png" />

Source/Editing/DragVerticesMode.cs

@@ -46,6 +46,9 @@ namespace CodeImp.DoomBuilder.Editing
 
 		#region ================== Variables
 
+		// Undo ticket
+		private int undoticket;
+		
 		// Mouse position on map where dragging started
 		protected Vector2D dragstartmappos;
 
@@ -70,6 +73,9 @@ namespace CodeImp.DoomBuilder.Editing
 			this.dragitem = dragitem;
 			this.dragstartmappos = dragstartmappos;
 
+			// Make undo
+			undoticket = General.Map.UndoRedo.CreateUndo("drag vertices", UndoGroup.None, 0, false);
+			
 			// Make old positions list
 			// We will use this as reference to move the vertices, or to move them back on cancel
 			oldpositions = new List<Vector2D>(General.Map.Selection.Vertices.Count);
@@ -101,6 +107,9 @@ namespace CodeImp.DoomBuilder.Editing
 		{
 			int i = 0;
 
+			// Withdraw undo
+			General.Map.UndoRedo.WithdrawUndo(undoticket);
+			
 			// Move geometry back to original position
 			foreach(Vertex v in General.Map.Selection.Vertices)
 			{
@@ -138,7 +147,6 @@ namespace CodeImp.DoomBuilder.Editing
 			// When not cancelled
 			if(!cancelled)
 			{
-				
 				// TODO: Merge geometry
 				
 

Source/Editing/UndoGroup.cs

@@ -0,0 +1,39 @@
+
+#region ================== Copyright (c) 2007 Pascal vd Heiden
+
+/*
+ * Copyright (c) 2007 Pascal vd Heiden, www.codeimp.com
+ * This program is released under GNU General Public License
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ */
+
+#endregion
+
+#region ================== Namespaces
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Text;
+using System.Windows.Forms;
+using System.IO;
+using System.Reflection;
+using CodeImp.DoomBuilder.Map;
+
+#endregion
+
+namespace CodeImp.DoomBuilder.Editing
+{
+	public enum UndoGroup : int
+	{
+		None = 0,
+		FloorTextureChange = 1,
+		CeilingTextureChange = 2
+	}
+}

Source/Editing/UndoManager.cs

@@ -0,0 +1,241 @@
+
+#region ================== Copyright (c) 2007 Pascal vd Heiden
+
+/*
+ * Copyright (c) 2007 Pascal vd Heiden, www.codeimp.com
+ * This program is released under GNU General Public License
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ */
+
+#endregion
+
+#region ================== Namespaces
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Text;
+using System.Windows.Forms;
+using System.IO;
+using System.Reflection;
+using CodeImp.DoomBuilder.Interface;
+using CodeImp.DoomBuilder.IO;
+using CodeImp.DoomBuilder.Map;
+using CodeImp.DoomBuilder.Rendering;
+using System.Diagnostics;
+using CodeImp.DoomBuilder.Controls;
+
+#endregion
+
+namespace CodeImp.DoomBuilder.Editing
+{
+	public class UndoManager : IDisposable
+	{
+		#region ================== Constants
+
+		#endregion
+
+		#region ================== Variables
+
+		// Undo and redo stacks
+		private Stack<UndoSnapshot> undos;
+		private Stack<UndoSnapshot> redos;
+
+		// Grouping
+		private UndoGroup lastgroup;
+		private int lastgrouptag;
+		
+		// Unique tickets
+		private int ticketid;
+		
+		// Disposing
+		private bool isdisposed = false;
+
+		#endregion
+
+		#region ================== Properties
+
+		public UndoSnapshot NextUndo { get { if(undos.Count > 0) return undos.Peek(); else return null; } }
+		public UndoSnapshot NextRedo { get { if(redos.Count > 0) return redos.Peek(); else return null; } }
+		public bool IsDisposed { get { return isdisposed; } }
+
+		#endregion
+
+		#region ================== Constructor / Disposer
+
+		// Constructor
+		public UndoManager()
+		{
+			// Initialize
+			ticketid = 1;
+			undos = new Stack<UndoSnapshot>();
+			redos = new Stack<UndoSnapshot>();
+
+			// Bind any methods
+			ActionAttribute.BindMethods(this);
+
+			// We have no destructor
+			GC.SuppressFinalize(this);
+		}
+
+		// Diposer
+		public void Dispose()
+		{
+			// Not already disposed?
+			if(!isdisposed)
+			{
+				// Unbind any methods
+				ActionAttribute.UnbindMethods(this);
+				
+				// Clean up
+				ClearUndos();
+				ClearRedos();
+				
+				// Done
+				isdisposed = true;
+			}
+		}
+
+		#endregion
+
+		#region ================== Private Methods
+
+		// This clears the redos
+		private void ClearRedos()
+		{
+			// Dispose all redos
+			foreach(UndoSnapshot u in redos) u.map.Dispose();
+			redos.Clear();
+		}
+
+		// This clears the undos
+		private void ClearUndos()
+		{
+			// Dispose all undos
+			foreach(UndoSnapshot u in undos) u.map.Dispose();
+			undos.Clear();
+		}
+
+		#endregion
+		
+		#region ================== Public Methods
+
+		// This makes an undo and returns the unique ticket id
+		public int CreateUndo(string description, UndoGroup group, int grouptag, bool allow3dchange)
+		{
+			UndoSnapshot u;
+			
+			// Not the same as previous group?
+			if((group == UndoGroup.None) ||
+			   (group != lastgroup) ||
+			   (grouptag != lastgrouptag))
+			{
+				// Next ticket id
+				if(++ticketid == int.MaxValue) ticketid = 1;
+
+				// Make a snapshot
+				u = new UndoSnapshot(description, allow3dchange, General.Map.Map.Clone(), ticketid);
+
+				// Put it on the stack
+				undos.Push(u);
+
+				// Clear all redos
+				redos.Clear();
+
+				// Keep grouping info
+				lastgroup = group;
+				lastgrouptag = grouptag;
+
+				// Update
+				General.MainWindow.UpdateInterface();
+
+				// Done
+				return ticketid;
+			}
+			else
+			{
+				return -1;
+			}
+		}
+
+		// This removes a previously made undo
+		public void WithdrawUndo(int ticket)
+		{
+			// Anything to undo?
+			if(undos.Count > 0)
+			{
+				// Check if the ticket id matches
+				if(ticket == undos.Peek().ticketid)
+				{
+					// Remove the last made undo
+					undos.Pop();
+					
+					// Update
+					General.MainWindow.UpdateInterface();
+				}
+			}
+		}
+
+		// This performs an undo
+		[Action("undo")]
+		public void PerformUndo()
+		{
+			UndoSnapshot u, r;
+
+			// Anything to undo?
+			if(undos.Count > 0)
+			{
+				// Get undo snapshot
+				u = undos.Pop();
+
+				// Make a snapshot for redo
+				r = new UndoSnapshot(u, General.Map.Map.Clone());
+
+				// Put it on the stack
+				redos.Push(r);
+
+				// Change map set
+				General.Map.ChangeMapSet(u.map);
+
+				// Update
+				General.MainWindow.RedrawDisplay();
+				General.MainWindow.UpdateInterface();
+			}
+		}
+		
+		// This performs a redo
+		[Action("redo")]
+		public void PerformRedo()
+		{
+			UndoSnapshot u, r;
+
+			// Anything to redo?
+			if(redos.Count > 0)
+			{
+				// Get redo snapshot
+				r = redos.Pop();
+
+				// Make a snapshot for undo
+				u = new UndoSnapshot(r, General.Map.Map.Clone());
+
+				// Put it on the stack
+				undos.Push(u);
+
+				// Change map set
+				General.Map.ChangeMapSet(r.map);
+
+				// Update
+				General.MainWindow.RedrawDisplay();
+				General.MainWindow.UpdateInterface();
+			}
+		}
+
+		#endregion
+	}
+}

Source/Editing/UndoSnapshot.cs

@@ -0,0 +1,63 @@
+
+#region ================== Copyright (c) 2007 Pascal vd Heiden
+
+/*
+ * Copyright (c) 2007 Pascal vd Heiden, www.codeimp.com
+ * This program is released under GNU General Public License
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ */
+
+#endregion
+
+#region ================== Namespaces
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Text;
+using System.Windows.Forms;
+using System.IO;
+using System.Reflection;
+using CodeImp.DoomBuilder.Interface;
+using CodeImp.DoomBuilder.IO;
+using CodeImp.DoomBuilder.Map;
+using CodeImp.DoomBuilder.Rendering;
+using System.Diagnostics;
+using CodeImp.DoomBuilder.Controls;
+
+#endregion
+
+namespace CodeImp.DoomBuilder.Editing
+{
+	public class UndoSnapshot
+	{
+		public MapSet map;
+		public string description;
+		public bool allow3dchange;		// True when allowed to change in 3D mode
+		public int ticketid;			// For safe withdrawing
+
+		// Constructor
+		public UndoSnapshot(string description, bool allow3dchange, MapSet map, int ticketid)
+		{
+			this.ticketid = ticketid;
+			this.description = description;
+			this.allow3dchange = allow3dchange;
+			this.map = map;
+		}
+
+		// Constructor
+		public UndoSnapshot(UndoSnapshot info, MapSet map)
+		{
+			this.ticketid = info.ticketid;
+			this.description = info.description;
+			this.allow3dchange = info.allow3dchange;
+			this.map = map;
+		}
+	}
+}

Source/General/MapManager.cs

@@ -77,6 +77,7 @@ namespace CodeImp.DoomBuilder
 		private WAD tempwad;
 		private MapSelection selection;
 		private GridSetup grid;
+		private UndoManager undoredo;
 		
 		// Disposing
 		private bool isdisposed = false;
@@ -100,7 +101,8 @@ namespace CodeImp.DoomBuilder
 		public GameConfiguration Config { get { return config; } }
 		public MapSelection Selection { get { return selection; } }
 		public GridSetup Grid { get { return grid; } }
-		
+		public UndoManager UndoRedo { get { return undoredo; } }
+
 		#endregion
 
 		#region ================== Constructor / Disposer
@@ -114,6 +116,8 @@ namespace CodeImp.DoomBuilder
 			// Basic objects
 			grid = new GridSetup();
 			selection = new MapSelection();
+			undoredo = new UndoManager();
+
 		}
 
 		// Diposer
@@ -130,6 +134,7 @@ namespace CodeImp.DoomBuilder
 
 				// Basic objects
 				if(selection != null) selection.Dispose();
+				if(undoredo != null) undoredo.Dispose();
 				
 				// Dispose
 				General.WriteLogLine("Unloading data resources...");
@@ -886,6 +891,18 @@ namespace CodeImp.DoomBuilder
 		
 		#region ================== Methods
 
+		// This sets a new mapset for editing
+		public void ChangeMapSet(MapSet newmap)
+		{
+			// Can't have a selection in an old map set
+			selection.ClearAll();
+
+			// Apply
+			map.Dispose();
+			map = newmap;
+			map.Update();
+		}
+		
 		// This reloads resources
 		[Action("reloadresources")]
 		public void ReloadResources()

Source/Interface/MainForm.cs

@@ -865,6 +865,20 @@ namespace CodeImp.DoomBuilder.Interface
 			itemlinedefsmode.Enabled = (General.Map != null);
 			itemsectorsmode.Enabled = (General.Map != null);
 			itemthingsmode.Enabled = (General.Map != null);
+			itemundo.Enabled = (General.Map != null) && (General.Map.UndoRedo.NextUndo != null);
+			itemredo.Enabled = (General.Map != null) && (General.Map.UndoRedo.NextRedo != null);
+
+			// Determine undo description
+			if(itemundo.Enabled)
+				itemundo.Text = "Undo " + General.Map.UndoRedo.NextUndo.description;
+			else
+				itemundo.Text = "Undo";
+
+			// Determine redo description
+			if(itemredo.Enabled)
+				itemredo.Text = "Redo " + General.Map.UndoRedo.NextRedo.description;
+			else
+				itemredo.Text = "Redo";
 			
 			// Toolbar icons
 			buttonmapoptions.Enabled = (General.Map != null);
@@ -872,6 +886,10 @@ namespace CodeImp.DoomBuilder.Interface
 			buttonlinedefsmode.Enabled = (General.Map != null);
 			buttonsectorsmode.Enabled = (General.Map != null);
 			buttonthingsmode.Enabled = (General.Map != null);
+			buttonundo.Enabled = itemundo.Enabled;
+			buttonredo.Enabled = itemredo.Enabled;
+			buttonundo.ToolTipText = itemundo.Text;
+			buttonredo.ToolTipText = itemredo.Text;
 		}
 		
 		#endregion

Source/Interface/MainForm.resx

@@ -147,10 +147,7 @@
   <metadata name="toolStripSeparator7.GenerateMember" type="System.Boolean, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
     <value>False</value>
   </metadata>
-  <metadata name="toolStripMenuItem4.GenerateMember" type="System.Boolean, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
-    <value>False</value>
-  </metadata>
-  <metadata name="toolStripSeparator2.GenerateMember" type="System.Boolean, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
+  <metadata name="toolStripMenuItem5.GenerateMember" type="System.Boolean, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
     <value>False</value>
   </metadata>
   <metadata name="menumain.Locked" type="System.Boolean, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
@@ -165,12 +162,21 @@
   <metadata name="toolbar.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
     <value>121, 17</value>
   </metadata>
+  <metadata name="toolStripSeparator10.GenerateMember" type="System.Boolean, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
+    <value>False</value>
+  </metadata>
   <metadata name="statusbar.Locked" type="System.Boolean, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
     <value>True</value>
   </metadata>
   <metadata name="statusbar.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
     <value>207, 17</value>
   </metadata>
+  <metadata name="toolStripMenuItem4.GenerateMember" type="System.Boolean, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
+    <value>False</value>
+  </metadata>
+  <metadata name="toolStripSeparator2.GenerateMember" type="System.Boolean, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
+    <value>False</value>
+  </metadata>
   <metadata name="panelinfo.Locked" type="System.Boolean, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
     <value>True</value>
   </metadata>

Source/Map/Linedef.cs

@@ -29,7 +29,7 @@ using SlimDX.Direct3D;
 
 namespace CodeImp.DoomBuilder.Map
 {
-	public class Linedef : IDisposable
+	public sealed class Linedef : IDisposable
 	{
 		#region ================== Constants
 
@@ -155,6 +155,17 @@ namespace CodeImp.DoomBuilder.Map
 
 		#region ================== Management
 
+		// This copies all properties to another line
+		public void CopyPropertiesTo(Linedef l)
+		{
+			// Copy properties
+			l.action = action;
+			l.args = (byte[])args.Clone();
+			l.flags = flags;
+			l.tag = tag;
+			l.updateneeded = true;
+		}
+		
 		// This attaches a sidedef on the front
 		public void AttachFront(Sidedef s)
 		{
@@ -228,17 +239,6 @@ namespace CodeImp.DoomBuilder.Map
 		{
 			updateneeded = true;
 		}
-
-		// This copies all properties to another line
-		public void CopyPropertiesTo(Linedef l)
-		{
-			// Copy properties
-			l.action = action;
-			l.args = (byte[])args.Clone();
-			l.flags = flags;
-			l.tag = tag;
-			l.updateneeded = true;
-		}
 		
 		#endregion
 		

Source/Map/MapOptions.cs

@@ -29,7 +29,7 @@ using CodeImp.DoomBuilder.Data;
 
 namespace CodeImp.DoomBuilder.Map
 {
-	public class MapOptions
+	public sealed class MapOptions
 	{
 		#region ================== Constants
 

Source/Map/MapSelection.cs

@@ -27,7 +27,7 @@ using CodeImp.DoomBuilder.Geometry;
 
 namespace CodeImp.DoomBuilder.Map
 {
-	public class MapSelection : IDisposable
+	public sealed class MapSelection : IDisposable
 	{
 		#region ================== Constants
 

Source/Map/MapSet.cs

@@ -31,7 +31,7 @@ using System.Drawing;
 
 namespace CodeImp.DoomBuilder.Map
 {
-	public class MapSet : IDisposable
+	public sealed class MapSet : IDisposable
 	{
 		#region ================== Variables
 
@@ -128,6 +128,10 @@ namespace CodeImp.DoomBuilder.Map
 			Dictionary<Linedef, Linedef> linedeflink = new Dictionary<Linedef, Linedef>(linedefs.Count);
 			Dictionary<Sector, Sector> sectorlink = new Dictionary<Sector, Sector>(sectors.Count);
 			
+			// TODO: Try making this faster by giving each element that
+			// requires a lookup (vertex/linedef/sector) a reference to
+			// its clone and remove those references after cloning.
+
 			// Create the map set
 			MapSet newset = new MapSet();
 

Source/Map/Sector.cs

@@ -27,7 +27,7 @@ using CodeImp.DoomBuilder.IO;
 
 namespace CodeImp.DoomBuilder.Map
 {
-	public class Sector : IDisposable
+	public sealed class Sector : IDisposable
 	{
 		#region ================== Constants
 
@@ -128,6 +128,21 @@ namespace CodeImp.DoomBuilder.Map
 
 		#region ================== Management
 
+		// This copies all properties to another sector
+		public void CopyPropertiesTo(Sector s)
+		{
+			// Copy properties
+			s.ceilheight = ceilheight;
+			s.ceiltexname = ceiltexname;
+			s.longceiltexname = longceiltexname;
+			s.floorheight = floorheight;
+			s.floortexname = floortexname;
+			s.longfloortexname = longfloortexname;
+			s.effect = effect;
+			s.tag = tag;
+			s.brightness = brightness;
+		}
+		
 		// This attaches a sidedef and returns the listitem
 		public LinkedListNode<Sidedef> AttachSidedef(Sidedef sd) { return sidedefs.AddLast(sd); }
 
@@ -155,19 +170,6 @@ namespace CodeImp.DoomBuilder.Map
 		// This detaches a thing
 		public void DetachThing(LinkedListNode<Thing> l) { if(!isdisposed) things.Remove(l); }
 		
-		// This copies all properties to another sector
-		public void CopyPropertiesTo(Sector s)
-		{
-			// Copy properties
-			s.ceilheight = ceilheight;
-			s.SetCeilTexture(ceiltexname);
-			s.floorheight = floorheight;
-			s.SetFloorTexture(floortexname);
-			s.effect = effect;
-			s.tag = tag;
-			s.brightness = brightness;
-		}
-		
 		#endregion
 
 		#region ================== Changes

Source/Map/Sidedef.cs

@@ -27,7 +27,7 @@ using CodeImp.DoomBuilder.IO;
 
 namespace CodeImp.DoomBuilder.Map
 {
-	public class Sidedef : IDisposable
+	public sealed class Sidedef : IDisposable
 	{
 		#region ================== Constants
 
@@ -140,9 +140,12 @@ namespace CodeImp.DoomBuilder.Map
 			// Copy properties
 			s.offsetx = offsetx;
 			s.offsety = offsety;
-			s.SetTextureHigh(texnamehigh);
-			s.SetTextureMid(texnamelow);
-			s.SetTextureLow(texnamemid);
+			s.texnamehigh = texnamehigh;
+			s.texnamemid = texnamemid;
+			s.texnamelow = texnamelow;
+			s.longtexnamehigh = longtexnamehigh;
+			s.longtexnamemid = longtexnamemid;
+			s.longtexnamelow = longtexnamelow;
 		}
 		
 		#endregion

Source/Map/Thing.cs

@@ -30,7 +30,7 @@ using System.Drawing;
 
 namespace CodeImp.DoomBuilder.Map
 {
-	public class Thing : IDisposable
+	public sealed class Thing : IDisposable
 	{
 		#region ================== Constants
 
@@ -63,7 +63,7 @@ namespace CodeImp.DoomBuilder.Map
 		// Configuration
 		private float size;
 		private PixelColor color;
-		private float iconoffset;
+		private float iconoffset;	// Arrow or dot coordinate offset on the texture
 		
 		// Selections
 		private int selected;
@@ -143,10 +143,13 @@ namespace CodeImp.DoomBuilder.Map
 			t.flags = flags;
 			t.tag = tag;
 			t.action = action;
-			t.args = EMPTY_ARGS;
 			t.x = x;
 			t.y = y;
 			t.zoffset = zoffset;
+			t.args = EMPTY_ARGS;
+			t.size = size;
+			t.color = color;
+			t.iconoffset = iconoffset;
 			args.CopyTo(t.args, 0);
 		}
 		

Source/Map/Vertex.cs

@@ -30,7 +30,7 @@ using System.Drawing;
 
 namespace CodeImp.DoomBuilder.Map
 {
-	public class Vertex : IDisposable
+	public sealed class Vertex : IDisposable
 	{
 		#region ================== Constants
 		

Source/Properties/Resources.Designer.cs

@@ -123,6 +123,13 @@ namespace CodeImp.DoomBuilder.Properties {
             }
         }
         
+        internal static System.Drawing.Bitmap Redo {
+            get {
+                object obj = ResourceManager.GetObject("Redo", resourceCulture);
+                return ((System.Drawing.Bitmap)(obj));
+            }
+        }
+        
         internal static System.Drawing.Bitmap SaveMap {
             get {
                 object obj = ResourceManager.GetObject("SaveMap", resourceCulture);
@@ -179,6 +186,13 @@ namespace CodeImp.DoomBuilder.Properties {
             }
         }
         
+        internal static System.Drawing.Bitmap Undo {
+            get {
+                object obj = ResourceManager.GetObject("Undo", resourceCulture);
+                return ((System.Drawing.Bitmap)(obj));
+            }
+        }
+        
         internal static System.Drawing.Bitmap UnknownImage {
             get {
                 object obj = ResourceManager.GetObject("UnknownImage", resourceCulture);

Source/Properties/Resources.resx

@@ -142,6 +142,9 @@
   <data name="NewMap" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\NewMap2.png;System.Drawing.Bitmap, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
+  <data name="Undo" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\Resources\Undo.png;System.Drawing.Bitmap, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  </data>
   <data name="ColorPick" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\ColorPick.png;System.Drawing.Bitmap, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
@@ -151,6 +154,9 @@
   <data name="UnknownImage" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\UnknownImage.png;System.Drawing.Bitmap, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
+  <data name="Grid2" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\Resources\Grid2.png;System.Drawing.Bitmap, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  </data>
   <data name="OpenMap" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\OpenMap.png;System.Drawing.Bitmap, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
@@ -175,7 +181,7 @@
   <data name="File" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\NewMap.png;System.Drawing.Bitmap, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
-  <data name="Grid2" type="System.Resources.ResXFileRef, System.Windows.Forms">
-    <value>..\Resources\Grid2.png;System.Drawing.Bitmap, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  <data name="Redo" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\Resources\Redo.png;System.Drawing.Bitmap, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
 </root>

Source/Resources/Actions.cfg

@@ -211,3 +211,21 @@ gridsetup
 	allowmouse = false;
 	allowscroll = false;
 }
+
+undo
+{
+	title = "Edit: Undo";
+	description = "Restores the current map as it was before last action(s) performed.";
+	allowkeys = true;
+	allowmouse = false;
+	allowscroll = false;
+}
+
+redo
+{
+	title = "Edit: Redo";
+	description = "Repeates the action(s) performed before Undo was used.";
+	allowkeys = true;
+	allowmouse = false;
+	allowscroll = false;
+}